Why does where-is-internal return nil?

Why does where-is-internal return nil?

[Juanma Barranquero]

A question about where-is-internal and keymaps.

I'm trying to do the following:

;;;; .emacs.el contains:

(global-set-key [f12] 'ielm)
(add-hook 'ielm-mode-hook
	  (lambda ()
	    (define-key ielm-map
                        (where-is-internal 'ielm nil t)
                        'ignore)))

;;; end of .emacs.el

According to docs, `where-is-internal' should be searching in "all the
currently active keymaps", because KEYMAP is nil.

Now:

  emacs     => we're on *scratch*
  f12       => ielm starts
  C-x k RET => ielm buffer deleted, we're back on *scratch*
  f12       => "Wrong type argument: arrayp, nil"

Somehow, on the second call, `where-is-internal' is returning nil. It
doesn't happen if I pass `global-map' to KEYMAP instead of nil, but that
means that, on the second call, `where-is-internal' is looking... where?

                                                           /L/e/k/t/u

Re: Why does where-is-internal return nil?

[Andreas Schwab]

Juanma Barranquero <lektu@mi.madritel.es> writes:

> Somehow, on the second call, `where-is-internal' is returning nil. It
> doesn't happen if I pass `global-map' to KEYMAP instead of nil, but that
> means that, on the second call, `where-is-internal' is looking... where?

The problem appears to be in current-active-maps, it returns a list that
includes ielm-map even though it is not active anymore.

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux AG, Maxfeldstraße 5, 90409 Nürnberg, Germany
Key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: Why does where-is-internal return nil?

[Juanma Barranquero]

On Sun, 25 Apr 2004 02:10:07 +0200, Andreas Schwab <schwab@suse.de> wrote:

> The problem appears to be in current-active-maps, it returns a list that
> includes ielm-map even though it is not active anymore.

Interesting (I didn't know about `current-active-maps').

BTW, it doesn't happen only with ielm-map. I did the test with
re-builder and it failed too.

Weird is, with ielm there's a flip-flop effect (you can run ielm, get
the error, run ielm, get the error), but with re-builder it was more
like: run, error, error, error...

Anyway, I'll take a look, but I think this is one for keyboard code
experts.



                                                           /L/e/k/t/u

Re: Why does where-is-internal return nil?

[Stefan Monnier]

>> Somehow, on the second call, `where-is-internal' is returning nil. It
>> doesn't happen if I pass `global-map' to KEYMAP instead of nil, but that
>> means that, on the second call, `where-is-internal' is looking... where?

> The problem appears to be in current-active-maps, it returns a list that
> includes ielm-map even though it is not active anymore.

What makes you think it's not active any more?
ielm-mode-hook is run in the ielm buffer with the ielm-map very
active indeed.  The first time around, the binding is found
in global-map, whereas the second time around the global binding is hidden
by ielm-map's nil binding.


        Stefan